Chicken Sandwich with Caramelised Onion

Ingredients: baguette bread (%50) [wheat flour, drinking water, sugar, vegetable oil (varying amounts palm, cottonseed, canola, sunflower), bread improver (calcium carbonate, ascorbic acid, fungal alpha-amylase, maltogenic amylase, lipase, hemicellulose, glucose oxidase), yeast, salt, wheat gluten, antioxidants (lactic acid), preservative (sodium acetate)], crispy chicken breast (%23,07) [chicken meat, coating agent (wheat flour, corn flour, modified corn starch, salt, spice blend (contains celery), egg protein, milk protein, yeast extract, raising agents (sodium polyphosphate, sodium hydrogen carbonate), stabiliser (methylcellulose), dextrose, sweet pepper extract)], caramelised onion (%11,54) [onion (%82), sugar, balsamic vinegar, sunflower oil, salt], mayonnaise [drinking water, vegetable oil (sunflower), modified corn starch, sugar, white vinegar, egg, salt, thickener (xanthan gum), lemon juice, onion powder, flavourings, preservatives (potassium sorbate, sodium benzoate), antioxidant (EDTA)].